package com.atguigu.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.Headers;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @author: 叶子
 * @date: 2022/02/09 12:30
 **/
// 1. SimpleChannelInboundHandler 是ChannelInboundHandlerAdapter 的子类
// 2. HttpObject 客户端和服务器端相互通讯的数据背封装成HttpObject
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
//    channelRead0 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
//  判断msg是不是httpRequest请求
        if (msg instanceof HttpRequest){
            System.out.println("pipeline hashcode="+ctx.pipeline().hashCode()+
                    " TestHttpServerHandler hashcode="+this.hashCode());
            System.out.println("msg 类型："+msg.getClass());
            System.out.println("客户端地址："+ctx.channel().remoteAddress());
            //获取到httpRequest
            HttpRequest httpRequest = (HttpRequest) msg;
//            获取uri，过滤特定资源
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())){
                System.out.println("请求了 favicon.ico,不作响应");
                return;
            }
//            回复信息给浏览器 【http协议】
            ByteBuf content = Unpooled.copiedBuffer("hello,我是服务器", CharsetUtil.UTF_8);
//            构造一个http的响应，即httpResponse
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());
//            将构建好的response返回
            ctx.writeAndFlush(response);
        }
    }
}